Fun Things you can do
Have a Trash-Off so that the more trash you pick up, the more rewards you get. Choose a really trashy spot, have people clean it up, then throw a party for those people. But don't trash it all over again!
Start a garden. It doesn't matter if it is potted or in the soil, grow your own food! Much of the food we eat comes packaged in plastic. Grow your own food. If you don't have the time of the place get food at a farmer's market.